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This article attempts to give a step by step walk through for creating a single Node Hadoop Cluster. It is an hands on tutorial so that even a novice user can follow the steps and create the Hadoop Cluster.

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In this hadoop tutorial we will have a look at the modification to our previous program wordcount with our own custom mapper and reducer by implementing a concept called as custom record reader. Before we attack the problem let us look at some theory required to understand the topic.